发明名称 |
Process for production of glass preform for optical fiber including consolidating in a furnace with a temperature gradient |
摘要 |
In order to provide an improved process for the production of a glass preform for an optical fiber which includes substantially no bubble formation therein and also has a substantially uniform shape, the present invention provides a process for the production of a glass preform which is at least partially formed from silica. In particular, a body is formed on a rod by depositing fine glass particles thereon, preferably by the vapor phase reactions, and heating the body to vitrify under a reduced atmosphere or a vacuumed atmosphere so that the glass preform is produced. According to this process, the heating includes a first heating step of degassing the body at a first heating temperature, a second heating step of shrinking the body at a second heating temperature which is higher than the first heating temperature and which is lower than a third heating temperature, and a third heating step of vitrifying the shrunken body at the third temperature which corresponds to a vitrification temperature of the fine glass particles so as to produce the glass preform.
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申请公布号 |
US5693115(A) |
申请公布日期 |
1997.12.02 |
申请号 |
US19940204100 |
申请日期 |
1994.03.02 |
申请人 |
SUMITOMO ELECTRIC INDUSTRIES, LTD. |
发明人 |
ITO, MASUMI;DANZUKA, TOSHIO;OHGA, YUICHI;HOSHINO, SUMIO;TSUCHIYA, ICHIRO |
分类号 |
C03B8/04;C03B20/00;C03B37/014;G02B6/00;(IPC1-7):C03B37/012 |
主分类号 |
C03B8/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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